PSLE Science 2012 Booklet A PDF

## PSLE Science 2012, Booklet A ### 0009/2 (A) **2 OCTOBER 2012** **SCIENCE (BOOKLET A)** **Total Time for Booklets A and B: 1h 45min** **Additional Materials: Optical Answer Sheet (OAS)** **Instructions to Candidates:** 1. Write your Index No. in the boxes at the top right-hand corner. 2. Do...

## PSLE Science 2012, Booklet A ### 0009/2 (A) **2 OCTOBER 2012** **SCIENCE (BOOKLET A)** **Total Time for Booklets A and B: 1h 45min** **Additional Materials: Optical Answer Sheet (OAS)** **Instructions to Candidates:** 1. Write your Index No. in the boxes at the top right-hand corner. 2. Do not turn over this page until you are told to do so. 3. Follow all instructions carefully. 4. Answer all questions. 5. Shade your answers on the Optical Answer Sheet (OAS) provided. **This booklet consists of 24 printed pages.** ### PART 1 (50 marks) For each question from 1 to 30, four options are given. One of them is the correct answer. Make your choice and shade the oval (1, 2, 3 or 4) on the Optical Answer Sheet. **1.** Some birds feed on the nectar of this flower. A diagram of a flower is provided with the nectar labelled. Which one of the following birds is best suited for pollinating this flower?: 1. A parrot 2. A hummingbird 3. A sparrow 4. A duck **2.** Which one of the following characteristics can be used to differentiate between birds and mammals? 1. number of legs 2. body temperature 3. presence of wings 4. type of body covering **3.** The diagram shows a plant cell. A diagram of a plant cell is provided with the following parts labelled: P, Q, R, and S. Which two parts are also found in animal cells? 1. P and Q 2. P and S 3. Q and R 4. R and S **4.** Which of the following feature(s) would most likely be found in plants growing in a hot and dry place? A. swollen stems B. short roots C. broad leaves 1. A only 2. B only 3. A and C only 4. B and C only **5.** The diagram shows a seed growing into a young plant. A diagram is provided. What is the direction in which food and water are being transported at X? A table is provided with the following options: Direction for transport of | Food | Water | |---|---| | upwards | upwards | | upwards | downwards | | downwards | downwards | | downwards | upwards | **6.** Which one of the following is correct? A table is provided with the following options: Organ involved in digestion of food | Organ involved in absorption of food | |---|---| | mouth | large intestine | | stomach | large intestine | | small intestine | small intestine | | large intestine | small intestine | **7.** A scientist observed that the temperature of the air on Earth has increased over the last ten years. Which of the following activities could have caused the increase in the temperature? A. An increase in the planting of trees. B. An increase in the use of air-conditioners. C. An increase in the use of solar energy. D. An increase in the number of vehicles on the road. 1. A and B only 2. B and D only 3. A and C only 4. C and D only **8.** Guohui wanted to keep a grasshopper as a pet. He thought of three possible ways A, B and C to keep his grasshopper. Three diagrams are provided, each labelled A, B and C. Which one of the following is correct? A table is provided with the following options: Least suitable way to keep the grasshopper | Most suitable way to keep the grasshopper | |---|---| | A | B | | B | C | | A | C | | B | A | **9.** Aini conducted an experiment to find out whether oxygen is needed for the germination of seeds. She used the setup shown below. A diagram is provided. Which one of the following should Aini use as a control for her experiment? Four diagrams are provided. Each contains a set up with a different combination of: substance that absorbs oxygen, substance that absorbs carbon dioxide, damp cotton wool and water. **10.** A flowering plant undergoes processes X and Y as shown. A diagram of the lifecycle of a plant is provided. Which of the following correctly represents the processes X and Y? A table is provided with the following options: X | Y | |---|---| | germination | fertilisation | | germination | pollination | | fertilisation | germination | | fertilisation | pollination | **11.** Swee Meng conducted an experiment with a flower on a plant. A diagram of a flower is provided with parts labelled A, B, C and D. He removed one part of the flower. The flower did not produce any seeds after that. Which part of the flower, A, B, C or D, did Swee Meng remove? 1. A 2. B 3. C 4. D **12.** Food relationships between organisms T, U and V are shown in the food web below. Two food webs are provided, the first shows relationships between organisms T, U and V, the second adds an organism W. The graph below shows the number of organism V over a period of time. A graph is provided. At which point of the graph was organism W first introduced? Points 1, 2, 3 and 4 are labelled on the graph. **13.** Kumar conducted an experiment using the following set-ups. Three diagrams are provided, labelled A, B and C. Each diagram shows a test tube containing a water plant, water, and air. Diagram A includes a light source, diagram B a stopper, and diagram C is next to a black box containing a fish What would be the likely change in the amount of carbon dioxide after a few hours? A table is provided with the following options: Amount of carbon dioxide in set-up | |---| | A | B | C | | increase | increase | no change | | decrease | no change | no change | | increase | no change | increase | | decrease | increase | increase | **14.** Study the chart below. A flow chart is provided. Which one of the following is correct? A table is provided with the following options: |P| Question Q | |---|---| | P is a non-flowering plant | Does it have bright-coloured flowers?| | P is a non-flowering plant | Does it pollinate with the help of wind? | | P is a decomposer | Does it have bright-coloured flowers? | | P is a decomposer | Does it pollinate with the help of wind? | **15.** James set up an experiment using four similar leaves P, Q, R and S on the same plant. These leaves have openings known as stomata on both their upper and lower surfaces. Leaves lose water through the stomata. He coated some surfaces of the leaves with oil as shown in the table. A table is provided with the following information: Coated with oil | |---| | Leaf | Upper surface | Lower surface | | P | yes| no | | Q | no | yes | | R | yes | yes | | S | no | no | The plant was under bright sunlight for two hours. James measured the volume of water loss at regular time intervals. His results are shown in the graph below. A graph is provided. James used his results to compare the difference between stomata on the upper and lower surfaces of the leaves. What can James conclude about the stomata on the leaves of this plant? 1. There are more stomata on the lower surfaces. 2. There are more stomata on the upper surfaces. 3. The openings of the stomata on the lower surfaces are bigger. 4. There are equal numbers of stomata on the upper and lower surfaces of leaves. **16** Selvi blew air into a balloon and tied it tightly. A diagram of a balloon is provided. After leaving the balloon in the refrigerator for a few hours, she observed that the balloon was smaller than before. Which one of the following is correct? Heat flowed from the: 1. refrigerator to the air inside the balloon 2. refrigerator to the material of the balloon 3. material of the balloon to the air inside the balloon 4. air inside the balloon to the material of the balloon **17.** A ball was thrown straight up into the air. It moved from P to Q as shown in Figure 1 and then dropped to P as shown in Figure 2. Diagrams are provided for Figure 1 and Figure 2. Which one of the following is correct? A table is provided with the following options: Potential energy of the ball from P to Q | Kinetic energy of the ball from Q to P| |---|---| | decreases | increases | | decreases | decreases | | increases | decreases | | increases | increases | **18.** Three bar magnets AB, CD and EF can be arranged as shown below. A diagram is provided. Which one of the following arrangements of the magnets is not possible? Four diagrams are provided, each showing a different arrangement of magnets. **19.** A glass beaker containing boiling water was left on a table. Which of the following action(s) would cool the boiling water in the shortest time? A. Put a metal spoon in the water. B. Cover the top of the beaker with a wooden lid. C. Wrap the beaker with a cloth that was wet with tap water. 1. A only 2. B only 3. A and C only 4. B and C only **20.** Study the circuit below. The batteries and bulbs are all working properly. A circuit diagram is provided. Which one of the following correctly states the number of bulb(s) that would still be lit when one or more bulbs are blown? A table is provided with the following options: Bulb(s) that is/are blown | Number of bulb(s) still lit | |---|---| | A | 1| | C| 3| | B and D | 2| | E and F | 4 | **21.** Kelly heated some ice cubes in a beaker using a Bunsen burner. After 10 minutes, all the ice melted. After another 10 minutes, the water started to boil. She then turned off the Bunsen burner 10 minutes after the water started to boil. Which one of the following graphs correctly shows the results of Kelly's experiment? Four graphs are provided, each showing a different temperature graph with time, all reaching 100°C at a different points. **22.** Mei Ling set up an experiment using a heat lamp, a piece of cardboard, a thermometer and a glass box with one side open. She covered the open side of the glass box with the cardboard. A diagram is provided. When x = 5 cm, Mei Ling recorded the temperature every 10 min after the lamp was switched on. She then repeated her experiment with x = 10, 15, 20 and 25 cm each time. Mei Ling wanted to investigate how the temperature recorded is affected by: 1. the thickness of the cardboard 2. the amount of heat produced by the lamp 3. the distance x between the lamp and the cardboard 4. the time taken for the heat to pass through the cardboard. **23.** An experiment was set up to investigate condensation of water vapour. The same amount of hot water at 90°C or ice-water at 0°C was poured into cups made of either glass or steel. The cups were of the same thickness, size and shape. Which one of the following correctly shows where water droplets would form after a short while? Four diagrams are provided, each showing two cups with either ice or hot water, one made of steel and the other made of glass. Each shows water condensation at a different point. **24.** Siva conducted an experiment using a wooden block W and a flat wooden plank XY placed horizontally as shown in Figure 1 below. Three diagrams are provided, labelled Figure 1, Figure 2 and Figure 3. Which of the following statements is/are correct? A. Frictional force acted on the block when it was resting on the plank in Figure 1. B. Frictional force acted on the block when the plank was being raised in Figure 2. C. Frictional force acted on the block when it was sliding down the plank in Figure 3. 1. A only 2. C only 3. B and C only 4. A, B and C **25.** The diagram below shows part of a roller coaster ride that can be found in amusement parks. A diagram is provided The roller coaster car travels from A to D. Which one of the following statements about the roller coaster car is correct? 1. Its kinetic energy at C is zero. 2. The gravitational force acting on it at D is zero. 3. The gravitational force acting on it at B is the same as the gravitational force acting on it at A. 4. Its total potential and kinetic energy at C is greater than its total potential and kinetic energy at B. **26.** Justin walked in a straight line from P to R as shown in Figure 1 below. At Q, he was directly under the lamp. The distance between P and Q is the same as the distance between Q and R. A diagram is provided. Figure 2 shows how the length of Justin's shadow on the ground changed during his walk. A graph is provided. Based on the graph in Figure 2, which one of the following statements about Justin's walk is not correct? 1. He took two times longer to walk from Q to R than to walk from P to Q. 2. He walked at a slower speed between P and Q than between Q and R. 3. When he was directly under the lamp, the length of his shadow was zero. 4. As he walked away from the lamp from Q to R, his shadow became longer. **27.** Gopal set up four electrical circuits P, Q, R and S using identical batteries and identical bulbs. The batteries and bulbs are all working properly. A circuit diagram is provided. Which one of the following is correct? A table is provided with the following options: Circuit(s) with brightly lit bulb(s) | Circuit(s) with dimly lit bulb(s) | |---|---| | P, R and S | Q | | Q and S | P and R | | R and S | P and Q | | P, Q and R | S | **28.** Shufen conducted an experiment using the set-up shown below. She measured the brightness of bulb X. A circuit diagram is provided. In her second experiment, she connected another identical bulb Y and a switch to this circuit. Both bulbs X and Y lit up. Shufen measured the brightness of bulb X again. She found that the brightness of bulb X remained the same in both experiments. Which of the following statement(s) about the circuit in Shufen's second experiment is/are correct? A. There is only one path for the current to flow. B. Each bulb can be switched on or off individually. C. When one bulb blows, the other bulb can still be lit. 1. A only 2. B only 3. A and C only 4. B and C only **29.** Mariam tested three types of string X, Y and Z by hanging weights from each string. She increased the weights until the string broke. The maximum weight that the strings could hold before breaking is shown below. A diagram is provided. Mariam then tried a few arrangements of hanging different weights. Which one of the following arrangements would be possible? Four diagrams are provided, each showing a different arrangement of three weights hanging from strings X, Y and Z. **30.** Four metal pins A, B, C and D were fixed onto a wooden board as shown in Figure 1 below. Figure 2 shows a battery and a bulb connected to two wires X and Y. Two diagrams are provided, labelled Figure 1 and Figure 2. Rui Yang connected some but not all of the pins on the wooden board in Figure 1 with wires. She then connected X and Y across different pairs of pins in turn. She recorded her results in the table below. A table is provided with the following options: Pin connected to X | Pin connected to Y | Did the bulb light up? | |---|---|---| | A | B | yes | | B | C | yes | | C | D | no | | D | A | no | Which one of the following correctly shows the connections made by Rui Yang? Four diagrams are provided, each showing a different arrangement of connections between points A, B, C and D.